import Vue from 'vue'
import VueRouter from 'vue-router'

Vue.use(VueRouter)

const Login = () => import('../components/Login.vue') 
const Home = () => import('../components/Home.vue') 

const routes = [
  {
    path:'',
    redirect:'/login'
  },
  {
    path:'/login',
    component: Login
  },
  { 
    path: '/home', 
    component: Home 
  }
]

const router = new VueRouter({
  routes,
  mode:'history'
})

// 挂载路由导航守卫
router.beforeEach((to, from, next) => {
  // to 将要访问的路径
  // from 代表从哪个路径跳转而来
  // next 是一个函数，表示放行
  //     next()  放行    next('/login')  强制跳转

  if (to.path === '/login') return next()
  // 获取token
  const tokenStr = window.sessionStorage.getItem('token')
  if (!tokenStr) return next('/login')
  next()
})


export default router
